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Thread: BMS repeater

  1. #1
    Join Date
    Dec 2010
    Somewhere in Cali

    BMS repeater

    Hello Control Gurus,

    I just want to ask you guys, how do you troubleshoot BMS Repeater and how do you guys know when the repeater is not working properly?

    Thank you for your time.

  2. #2
    Join Date
    Apr 2005
    2444 Washington Blvd, Suite 100 Ogden, UT
    Start out withan accurate drawing for the network installation. If you are seeing successful I/O to all devices before the repeater on the network, but a lot more failures after that point in the network you should suspect that the repeater is bad. I've seen intermittant failures where a repeater will fail, work OK for awhile after power cycling it, then fail again. So, sometimes you need to look at trends over time to isolate the problem.
    Steve Jones
    Managing Partner
    The S4 Group, Inc.

  3. #3
    Join Date
    Jul 2006
    Southern California
    Steve's comments are right on target.

    One of the things I often do with a "repeated BMS comm segment" is to put in custom
    "data handshake programs" into controllers on both sides of the repeator. The handshake programs
    send date/time stamped AI, AO, BI, and BO data packets to the BMS Server, and, just as Steve
    suggested, I trend them to spot potential issues quickly.

    Additionally, I have custom alarming logic that compares the "repeated data packets" to
    pre defined "acceptable variables", that can send an alarm, and email, to the operator when there
    is defective repeator responses. The programs are extremely simple and very low
    "data overhead" on the buss.

    Anyway, good question.
    "We are what we repeatedly do. Excellence, then, is not an act, but a habit" Aristotle

    Remember to "Pay it Forward"; help out the newer generation of techs, remember someone during our career helped us! ("Pay it Forward" was by someone smarter than me!!)

  4. #4
    Join Date
    Dec 2010
    Somewhere in Cali
    Thank you guys for promptly respond. This is an invaluable source of information.

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